SPIE Journal

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The portion of the image which appears at the screen center on low magnification
will also be at the center on high magnification. ... Photomultipliers analyze the
light projected through a small field, including the star image, and control stage
motions so as to bring the plate ... and uses this record, rather than manual
operations, to drive the engine in sequence to the various stars which must be
measured.

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SPIE Journal

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- 1962

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